A MYSTERIOUS plane has once again been seen flying over Worcester but defence chiefs say they don't think it is anything to do with them.

Matthew Brown, 45, of Salters Close, Blackpole, Worcester, said he believed the plane was circling at about 10,000 feet and suspected it could be a De Havilland Canada DHC-6 Twin Otter or a Britten-Norman Islander.

But an RAF spokesman said: "It's unlikely to be one of ours. We have no exercises going on. I feel this is probably a civilian plane."

He also said it could be a mail plane, a pilot training or a someone conducting an aerial survey of the city.

Mr Brown, a landscape gardener, said he could still hear its engines when he had his ear defenders on and it had been circling the city for weeks, usually beginning its route shortly after 9am each day.

He said: "if it's buzzing overhead for a long time it would drive you insane. It goes out of earshot then a few minutes later it comes back again."

A Hercules was also spotted over Worcester in June as part of a three-day trial of some new equipment although the MOD refused to confirm what the equipment was used for.